JP2003001565A - Manufacturing method of polishing grinding stone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method by which a polishing grinding stone having an abrasive grain layer can be formed at low-cost and in a short time. SOLUTION: An abrasive grain mixed adhesive resin 13 made by mixing abrasive grains 14 and thermosetting adhesive resin material, and a grinding stone base material 11 are successively provided on a transfer die formed in a shape having uneven relation to the polishing grinding stone to be manufactured. The transfer die, abrasive grain mixed adhesive resin and grinding stone base material are rotated, wherein the thermosetting adhesive resin is hardened by heating the abrasive grain mixed adhesive resin at least, while moving abrasive grains in the abrasive grain mixed adhesive resin to the surface of the transfer die by the centrifugal force. By so doing, the abrasive grain mixed adhesive resin is combined with the grinding stone base material. Then, the grinding stone base material with which the grinding stone base material is combined, is separated from the transfer die to obtain the polishing grinding stone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a polishing grindstone having an abrasive grain layer.

[0002]

2. Description of the Related Art Conventionally, a polishing grindstone in which an abrasive grain layer is formed on a polishing surface has been known. The abrasive grain layer of such a polishing grindstone can be formed, for example, by solidifying diamond abrasive grains with a soft adhesive resin material.
If the diamond abrasive grains are densely formed on the polishing surface when forming the abrasive grain layer, a small amount of diamond abrasive grains can be used, which can contribute to cost reduction.

Therefore, conventionally, the following two manufacturing methods are generally adopted. In the first method, as shown in FIG. 8, first, an adhesive mixture A ′, in which a soft adhesive resin material 13 ′ and diamond abrasive grains 14 are mixed almost uniformly, is poured into a transfer die 15, and a grindstone substrate (base metal ) 11 is glued to the transfer mold 15 via the glue mixture A ′. After the bonding is completed, the grindstone base material 11 is released from the transfer mold 15 to obtain a polishing grindstone. On the other hand, in the second method, as shown in FIG. 9, first, diamond abrasive grains 14 are spread almost evenly on the transfer mold 15, and then the adhesive resin material 13 ′ is poured into the transfer mold 15 to bond the grindstone base material 11. The resin material 13 ′ is adhered to the transfer mold 15. After the bonding is completed, the grindstone base material 11 is released from the transfer mold 15 to obtain a polishing grindstone.

However, in the first method, it is difficult to collect the diamond abrasive grains 14 on the polishing surface, and if it waits until the diamond abrasive grains 14 settle, it takes too much time. Further, in the second method, when the adhesive resin material 13 ′ flows between the diamond abrasive grains 14, air is mixed and an air pocket 30 is formed, which reduces the strength of the polishing portion. Therefore, the air trap 3 is generated by the defoaming process.
Since it is necessary to remove 0, the production efficiency deteriorates, which is not preferable.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a manufacturing method capable of forming a polishing grindstone having an abrasive grain layer at low cost and in a short time.

[0006]

SUMMARY OF THE INVENTION The present invention is intended to reduce the manufacturing time and cost of a polishing whetstone having an abrasive grain layer by moving the abrasive grains to the polishing surface of the polishing whetstone by utilizing centrifugal force. is there. That is, the present invention is a step of mixing the abrasive grains and the thermosetting adhesive resin material to obtain an abrasive grain mixed adhesive resin, and on a transfer mold processed into a shape having a relationship of unevenness with the polishing surface of the polishing grindstone to be manufactured. The step of placing the abrasive-particle-mixing adhesive resin and the grindstone base material in sequence and sandwiching the abrasive-particle-mixing adhesive resin between the transfer die and the grindstone base material, and the transfer die, the abrasive-particle-mixing adhesive resin and the grindstone base material. , A step of rotating the transfer die so that the grindstone base material is located inside the rotation axis on the outside of the rotation axis, and moving the abrasive grains in the abrasive-particle-mixed adhesive resin to the transfer die surface by the centrifugal force, and this rotation During the movement, at least the abrasive mixed adhesive resin is heated to cure the thermosetting adhesive resin material, the step of bonding the abrasive mixed adhesive resin and the grindstone substrate, and the grindstone combined with the abrasive mixed adhesive resin A step of releasing the base material from the transfer mold to obtain a polishing grindstone. And wherein the Rukoto.

In the above-mentioned method of manufacturing a polishing grindstone, the abrasive grains may be diamond abrasive grains.

[0008]

1 is a schematic cross-sectional view showing an example of a completed state of a polishing grindstone 10 manufactured by the method of the present invention. The polishing grindstone 10 includes a grindstone base material (base metal) 11 and a convex spherical polishing portion 12 bonded to an upper surface of the grindstone base material 11. The polishing part 12 is formed by a resin bond 13 which is a thermosetting adhesive resin material and diamond abrasive grains 14, and the diamond abrasive grains 14 are densely packed on the polishing surface 12a.

FIG. 2 is a schematic sectional view showing a centrifugal device 20 used in the manufacturing process of the polishing grindstone 10. Centrifuge 2
0 includes a storage container 21, a rotating member 22 that rotatably supports the storage container 21, and a drive motor 23 that rotates the rotating member 22. The storage container 21 and the rotating member 22 have a heater 31 on the inner surface. It is disposed inside the heat insulating container 30.

The rotary member 22 comprises a rotary shaft 22a and a rotary arm 22b which rotates about the rotary shaft 22a. When the rotating member 22 is stationary, the storage container 21 is held in a state where the longitudinal direction thereof is the vertical direction in FIG. 2 (the state shown by the solid line in FIG. 2). On the other hand, when the rotating member 22 is rotating, the centrifugal force F acts in a direction perpendicular to the rotating shaft 22a and away from the rotating shaft 22a, and the longitudinal direction of the storage container 21 is left and right in FIG. It is held in a directional state (state shown by the dotted line in FIG. 2). When heating is performed by the heater 31 while the rotating member 22 is rotating, the storage container 21 is warmed from the bottom surface portion 21a.

The grinding wheel 10 is manufactured as follows. A transfer mold 15 (FIG. 3) having a concave portion 15a having a concave-convex relationship with the polishing portion 12 to be manufactured is prepared in advance.
A release agent is applied to 5a. This is to facilitate the separation of the grindstone base material 11 from the transfer mold 15 in a later step. On the other hand, the resin bond 13 and the diamond abrasive grains 14 are mixed almost uniformly to form the adhesive mixture A.

Next, the adhesive mixture A is placed on the recess 15a substantially uniformly (FIG. 4), and the grindstone substrate 11 is placed on the adhesive mixture A.
Is pressed (FIG. 5), and the grindstone base material 11 adhered to the transfer mold 15 is stored in the storage container 21 of the centrifugal device 20 (FIG. 6).

Subsequently, the drive motor 23 of the centrifugal device 20 is operated to rotate the rotating member 22. When the rotating member 22 rotates, the storage container 21 performs a rotational movement with the transfer die 15 positioned outside the rotating shaft 22a and the grindstone base material 11 inside, and the rotating centrifugal force causes the adhesive mixture A to rotate.
The diamond abrasive grains 14 inside move to the surface of the recess 15 a of the transfer mold 15.

Then, while the rotating member 22 is continuously rotated and the diamond abrasive grains 14 are all moved to the surface of the concave portion 15a, heating by the heater 31 is started to warm the inside of the heat insulating container 30 and cure the resin bond 13.

After the resin bond 13 is hardened, the heating by the heater 31 is stopped and the drive motor 23 is stopped. Then, the grindstone base material 11 and the transfer die 15 are taken out from the storage container 21, and the grindstone base material 11 is released from the transfer die 15 (FIG. 7). On the upper surface of the released grindstone base material 11, the polishing portion 12 in which the diamond abrasive grains 14 are densely gathered on the polishing surface 12a is formed.
Are joined together, and the polishing grindstone 10 shown in FIG. 1 is obtained.

As described above, in this embodiment, the diamond abrasive grains 14 in the adhesive mixture A are moved to the polishing surface 12 by utilizing the centrifugal force, so that the diamond abrasive grains are easily concentrated on the polishing surface in a short time. be able to. As a result, the diamond abrasive grains used to form the polishing portion can be saved and the cost can be reduced. Further, in this embodiment, the air force that has been mixed in the adhesive mixture A can be removed by the centrifugal force, so that the strength of the polishing portion can be sufficiently ensured. Further, it is not necessary to perform defoaming treatment, which leads to improvement of production efficiency.

[0017]

According to the method for manufacturing a polishing grindstone of the present invention,
It is possible to form a polishing grindstone having an abrasive grain layer on the polishing surface at low cost and in a short time.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a polishing grindstone formed by a method for manufacturing a polishing grindstone according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a centrifugal device used in the method for manufacturing a polishing grindstone of the present invention.

FIG. 3 is a cross-sectional view showing an example of a transfer mold used in the method for manufacturing a polishing grindstone of the present invention.

4 is a schematic cross-sectional view showing a state in which a mixture of diamond abrasive grains and resin bonds is placed on the transfer die of FIG.

5 is a schematic cross-sectional view showing a state in which a grindstone base material is bonded to the transfer die shown in FIG.

FIG. 6 is a schematic cross-sectional view showing a storage container that stores the grindstone base material and the transfer mold shown in FIG.

FIG. 7 is a schematic cross-sectional view showing a grindstone base material released from a transfer mold.

FIG. 8 is a diagram for explaining one of the conventional methods for manufacturing a grinding wheel.

FIG. 9 is a diagram for explaining one of the conventional methods for manufacturing a grinding wheel.

[Explanation of symbols]

10 Polishing whetstone 11 Whetstone base 12 Polishing section 12a Polished surface 13 Resin bond 14 diamond abrasive 15 transfer type 15a recess 20 Centrifuge 21 Storage container 22 Rotating member 23 Drive motor 30 insulated container 31 heater

Claims (2)

[Claims] 1. A step of mixing abrasive grains and a thermosetting adhesive resin material to obtain an abrasive grain mixed adhesive resin, and a step of processing on a transfer mold which is processed into a shape having a concave-convex relationship with a polishing surface of a polishing grindstone to be manufactured. The step of placing the abrasive-particle-mixed adhesive resin and the grindstone base material in order and sandwiching the abrasive-particle-mixed adhesive resin between the transfer die and the grindstone base material, and the transfer die, the abrasive-particle-mixed adhesive resin and the grindstone base material. , A step of rotating the transfer die so that the grindstone base material is located inside the rotation axis on the outside of the rotation axis, and moving the abrasive grains in the abrasive-grain mixed adhesive resin to the transfer die surface by the centrifugal force, During movement, at least the abrasive mixed adhesive resin is heated to cure the thermosetting adhesive resin material, and the abrasive particle mixed adhesive resin and the grindstone base material are bonded together; Releasing the base material from the transfer mold to obtain a polishing grindstone. A method of making an abrasive grinding wheel, characterized in that. 2. The method for producing a polishing grindstone according to claim 1, wherein the abrasive grains are diamond abrasive grains.